Exterior rearview mirror assembly

ABSTRACT

An exterior rearview mirror assembly for mounting at a vehicle includes a base portion configured for attachment at a side of the vehicle, and a mirror head having a mirror reflective element, an attachment plate and an electrically-operable mirror actuator. The base portion extends through an aperture in the mirror head. The mirror actuator is attached at the attachment plate, which includes wall structure that extends from the front side of the attachment plate and that circumscribes and spans a perimeter circumferential edge of a glass substrate of the mirror reflective element. The mirror actuator is electrically operable to adjust the mirror head relative to the base portion. The aperture allows for movement of the mirror head relative to the base portion during operation of the mirror actuator.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent application Ser. No. 16/640,553, filed Feb. 20, 2020, now U.S. Pat. No. 11,148,596, which is a 371 national phase filing of PCT Application No. PCT/US2018/047687, filed Aug. 23, 2018, which claims the filing benefits of U.S. provisional applications, Ser. No. 62/674,057, filed May 21, 2018, and Ser. No. 62/549,102, filed Aug. 23, 2017, which are hereby incorporated herein by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates generally to the field of rearview mirror assemblies for vehicles and, more particularly, to an exterior rearview mirror assembly that is operable to provide an adjustable rearward field of view for a driver of an equipped vehicle.

BACKGROUND OF THE INVENTION

Typically, an exterior rearview mirror assembly includes a mirror actuator that is operable to adjust a mirror reflective element relative to the mirror casing so as to adjust a rearward field of view of the mirror reflective element of the mirror assembly for viewing by the driver of the vehicle. The reflective element and actuator are disposed in the mirror casing and the actuator adjusts the reflective element relative to the mirror casing. In such conventional exterior mirror assemblies, operation of the mirror actuator does not adjust or move the position of the mirror casing. In such conventional exterior rearview mirror assemblies, a powerfold actuator disposed at a mounting structure can be operable to pivot or fold the mirror casing relative to the side of the vehicle.

SUMMARY OF THE INVENTION

The present invention provides an exterior rearview mirror assembly configured for mounting at an exterior portion of a vehicle. The exterior rearview mirror assembly comprises a mirror head and includes a mirror actuator that is operable to pivot and adjust the mirror head relative to a mounting arm or base that attached at the side of the vehicle. The mirror head comprises a mirror reflective element and a mirror casing that both move/adjust together similarly and in tandem with movement/adjustment of the mirror head relative to the mounting arm/base that is attached at the side of the vehicle. Movement/adjustment of the mirror head by operation of the mirror actuator causes the mirror reflective element to move/adjust similarly and in tandem with movement/adjustment of the mirror head so that, via operation of the mirror actuator by a driver of the vehicle, the rearward field of view of the mirror reflective element as viewed by the driver of the vehicle can be set to that driver's desires/needs. The mirror assembly may also include a powerfold actuator that provides a powerfold adjustment to move the mirror head relative to the side of the vehicle from an extended position (used during normal driving of the vehicle) to a folded-to-the-vehicle/stowed position (used during such as when the vehicle is parked and is not being driven normally).

The mirror head can house an accessory that moves in tandem with the mirror reflective element and the mirror casing of the mirror head, and the accessory is adapted to provide a function to meet regulation/performance requirements throughout the range of adjustment of the mirror head relative to the mounting arm/base as attached at the side of the vehicle. For example, the accessory may comprise a turn signal indicator which, when activated, emits a beam of light that spans and satisfies a regulation-required region throughout the range of adjustment of the mirror head relative to the mounting arm/base throughout the range of adjustment via the mirror actuator of the field of view of the mirror reflective element for viewing by the driver of the vehicle. Optionally, the accessory may comprise a camera that has a field of view rearward, sideward and/or forward of where the camera is disposed at the mirror assembly at the side of the vehicle, with the camera's field of view being sufficiently wide so as to encompass a target region throughout the range of adjustment of the mirror head relative to the mounting arm and the side of the vehicle. An image processor may process image data captured by the camera to digitally and dynamically crop the frames of captured image data (and to electronically reduce optical distortion due to the wide-angle lensing used with such camera) in accordance with or responsive to or as a function of the position or orientation of the mirror head as adjusted by the driver such that the image data used for display at a video screen viewable by the driver or for machine vision-based object detection or the like is electronically cropped or limited to encompass the desired or appropriate or selected region at the side of the vehicle.

These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exterior rearview mirror assembly in accordance with the present invention;

FIG. 2 is a perspective view of the mirror actuator mounting plate at the rear of the mirror reflective element;

FIG. 3 is another perspective view of the mirror actuator mounting plate and mirror backing plate;

FIG. 4 is a perspective view of the mirror backing plate (with the mirror reflective element not attached thereat);

FIG. 5 is a perspective view of a mirror backing plate with an integral actuator adapter plate in accordance with the present invention;

FIG. 6 is a plan view of the mirror backing plate of FIG. 5 ;

FIG. 7 is a perspective view of the mirror backing plate, with an actuator attached thereat;

FIG. 8 is a perspective view of a mirror casing and actuator bracket for the mirror assembly of the present invention;

FIG. 9 is a sectional view of the mirror casing and actuator bracket of FIG. 8 ;

FIG. 10 is a rear perspective view of the mirror assembly of the present invention;

FIG. 11 is another rear perspective view of the mirror assembly, with a rear portion of the mirror casing removed to show additional details;

FIG. 12 is a sectional view of the mirror assembly of FIG. 11 ;

FIG. 13 is a perspective view of the actuator bracket and mirror reflective element assembly, shown with an optional wind load stabilizer;

FIG. 14 is a sectional view of the mirror head of FIG. 13 ;

FIG. 15 is another sectional view of the mirror head of FIG. 13 ;

FIGS. 16 and 17 are perspective views of another mirror assembly in accordance with the present invention;

FIG. 18 is a perspective view of the mirror assembly of FIG. 16 , with the mirror casing removed to show the actuator and bracket;

FIG. 19 is a sectional view of the mirror assembly of FIG. 16 ; and

FIG. 20 is an exploded perspective view of the mirror assembly of FIG. 16 .

FIG. 21 is a plan view of the mirror assembly of the present invention as mounted at a side region of a vehicle, showing the range that a turn signal indicator should cover to accommodate adjustment of the mirror head;

FIG. 22 is a chart showing illumination requirements for the turn signal indicator;

FIG. 23 is another plan view of the mirror assembly of the present invention as mounted at a side region of a vehicle, showing the range that a field of view of a camera should encompass to accommodate adjustment of the mirror head;

FIGS. 24A-C are plan views of the mirror casing supporting reflective elements having different radii of curvature;

FIGS. 25A-C are side elevations of the mirror casing and reflective elements of FIGS. 24A-C, respectively;

FIG. 26 is a perspective view of another mirror reflective element of the present invention, shown with a flush wide angle auxiliary mirror reflector;

FIG. 27 is another perspective view of the mirror reflective element of FIG. 26 ;

FIG. 28 is another perspective view of the mirror reflective element of FIG. 26 ; and

FIG. 29 is block diagram showing a control function for the mirror assembly of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An exterior rearview mirror assembly of the present invention may comprise dual actuators and dual pivot axes for adjusting a mirror head and reflective element relative to a side of a vehicle at which the mirror assembly is mounted. The mirror assembly may utilize aspects of the mirror assemblies described in U.S. Publication Nos. US-2015-0224930 and/or US-2015-0097955, and/or U.S. Pat. Nos. 9,487,142; 9,346,403 and/or 8,915,601, and/or PCT Application No. PCT/IB2018/056228, filed Aug. 17, 2018, which are hereby incorporated herein by reference in their entireties.

Referring now to the drawings and the illustrative embodiments depicted therein, and with reference to FIGS. 1-7 , an exterior rearview mirror assembly 10 includes a mirror reflective element 12 attached at an actuator 22 (via a back plate 24 and a head mounting plate 26 and actuator adaptor plate 28) that is operable to adjust the mirror reflective element relative to a mounting arm or base portion 18 (that fixedly attaches such as via bolts at the vehicle, and such as via bolting at a front door portion of the vehicle). The mirror head 20 comprises the mirror reflective element 12, the back plate 24 and the mirror casing 14. In the illustrated embodiment, the mirror reflective element 12 is attached to the back plate or glass case 24, which is attached at the head mounting plate 26, which has the mirror casing 14 attached thereto. The mirror reflective element 14 thus attaches to a polymeric molded mirror backing plate that, at one side, supports the mirror reflective element (and typically with a heater pad disposed therebetween), and at the other opposing side, includes structure for mounting at the mirror actuator 22. The backing plate and/or structure may utilize aspects of the mirror assemblies described in U.S. Pat. Nos. 8,058,977; 7,944,371 and/or 7,581,859, which are hereby incorporated herein by reference in their entireties.

The mirror head 20 is adjustable relative to the base portion 18 (such as at an outer end portion 16 of the base portion 18) via the actuator 22 fixedly attached at a bracket portion 23 a (FIGS. 8 and 9 ) of the mirror assembly. As shown in FIGS. 8-12 , a mounting post or structure 23 b is received through or disposed at a gap or opening or aperture of the mirror casing 14, with the opening providing clearance or a gap between the casing wall and the mounting post to allow for adjustment of the mirror casing and reflective element (the mirror head) relative to the base portion 18, without direct contact or fouling between the mirror casing and the base portion during mirror head adjustment (but optionally with sealing and/or sliding contact between a gasket or seal and the mirror casing and/or base portion, as discussed below). The mirror casing may be formed by polymeric molding (such as injection molding) and the opening or hole or aperture may be established through the mirror casing during the molding of the mirror casing.

The actuator 22 is mounted at the bracket portion 23 a at the upper end of mounting post or structure 23 b and is operable to adjust the mirror back plate and reflective element and mirror casing in tandem to adjust the rearward field of view of the reflective element as viewed by the driver of the vehicle. The actuator 22 provides both vertical and horizontal adjustment of the mirror head relative to the base portion (e.g., up and down and side-to-side adjustment of the mirror head to vertically and/or horizontally adjust the field of view of the reflective element as viewed by the driver). Actuator 22 preferably comprises two motors that are electrically operable to adjust the mirror head in two orthogonal directions and can be constructed utilizing aspects of the actuators described in U.S. Pat. Nos. 5,986,364; 7,090,363 and/or 6,213,612, which are all hereby incorporated herein by reference in their entireties. The mirror head 20 may also pivot about a generally vertical or canted pivot axis to provide a breakaway mirror configuration (and optionally, another actuator may be disposed at the base portion or bracket to provide a powerfold function, as discussed below). Powerfold functions are described in likes of U.S. Pat. Nos. 7,093,946 and 7,887,202, which are hereby incorporated herein by reference in their entireties.

In the illustrated embodiment, the mirror casing is fixed relative to the glass or reflective element and is adjustable via the actuator relative to the bracket or mounting arm or mounting base. In a typical conventional outside mirror, the reflective element is adjustable independently of the mirror casing, which is fixed to the bracket. Thus, in a conventional outside mirror, when in use on a vehicle, the mirror casing is at a fixed/non-varying position relative to the side of the vehicle, and adjustment by the driver of the mirror reflective element has no impact and causes no change to the position of the mirror casing relative to the side of the vehicle. In sharp contrast, and as in the illustrated embodiment, the mirror casing moves with the reflective element (so that the entire mirror head is adjusted or moves to adjust the rearward field of view at the reflective element). For sake of clarity, the assembly of the mirror casing, head mounting plate, glass-case or back plate, tape and reflective element is referred to as the mirror head or mirror head assembly. The bracket design is used as a mount for the mirror actuator and is coupled with the base to provide a folding pivot.

As shown in FIGS. 2-4 , the glass case or back plate is attached to the actuator through the head mounting plate. The head mounting plate attaches to the glass actuator adapter plate through a glass case clip ring. The glass case or back plate attaches to the head mounting plate with four clips 25 on the outer perimeter highlighted by the larger circles in FIG. 2 . The glass case also provides additional support to the glass case clip ring by backing up the head mounting plate clips with eight bosses 27 highlighted by the smaller circles in FIG. 2 . Optionally, and such as shown in FIGS. 3 and 4 , the head mounting plate may be attached to the glass actuator adapter plate by a radial pattern of screws or fasteners 29 (see circles in FIGS. 3 and 4 ).

Thus, in the illustrated embodiment, the mirror reflective element is attached at the back plate 24 (such as via an adhesive or tape or via an adhesively applied heater pad or the like), and the back plate 24 is snap attached at the head mounting plate 26 via the snap tabs 25 protruding through openings in the head mounting plate and engaging a surface of the head mounting plate to limit or preclude retraction of the tabs from the head mounting plate. The actuator adapter plate 28 may snap attach at the head mounting plate or may be fastened thereto via a plurality of fasteners. The actuator is mounted at the actuator adapter plate via fasteners or snap attachment or the like, whereby actuation of the actuator adjusts or moves the actuator adapter plate, the head mounting plate, the back plate, the reflective element, and the mirror casing, together and in tandem with one another, relative to the mounting portion or base portion.

Referring now to FIGS. 5-7 , a full width glass actuator adapter plate may replace the adapter plate. The profile of the full width adapter plate matches the glass and housing profile and allows for the attachment of the housing with screws (or other fasteners or clips or the like) and for the glass case with clips on the perimeter as well as a glass case clip ring. As shown in FIG. 7 , the actuator 22 attaches to the adapter plate, and the actuator is mounted or attached at the bracket 23 a (FIGS. 8 and 9 ).

As shown in FIGS. 8 and 9 , the bracket 23 a includes the post portion 23 b that pivotally mounts to the base portion 18. A gasket or head seal 30 is provided at the post 23 b to generally seal or close over the opening of the mirror casing to limit water or dirt intrusion into the mirror casing. The head seal may comprise any suitable material, such as, for example, an EPDM rubber material. In the illustrated embodiment, the head seal comprises a flexible bellows configuration or design that allows movement of the mirror head relative to the mounting base and protects the internal components of the mirror assembly from water and contamination.

Optionally, the mirror assembly may also provide a power fold function that operates to pivot the mirror head about a generally vertical or canted axis between a use position (where the mirror head is extended from the side of the vehicle and the reflective element is viewable by the driver of the vehicle and provides the driver with the desired or selected rearward field of view) and a folded or non-use or park position (where the mirror head is folded toward the side of the vehicle so that the reflective element is generally along the side of the vehicle and does not provide the driver with the selected rearward field of view). Optionally, for example, and with reference to FIGS. 10-12 , the glass actuator bracket also houses a powerfold actuator 32 near the opening of the housing where the base enters the mirror head. The powerfold actuator operates to rotate the mirror head about a pivot assembly 32 a to pivot the mirror head between the use and non-use positions. This creates a separate folding pivot from the mirror head pivot about the glass actuator.

Optionally, and such as shown in FIGS. 13-15 , the mirror head may include an additional spring-loaded touch-off component or stability element 34 disposed between the housing or casing and the glass actuator bracket. As shown in FIGS. 13-15 , the spring-loaded component 34 may be disposed near the outboard forward side of the mirror head, and provides further stability when the mirror head is subjected to high speed wind-loads as may be encountered as the vehicle travels along a highway or the like. In the illustrated embodiment, the mirror head includes a boss or projection 36 at its inner surface, while the actuator bracket includes a spring-loaded element 34 that is urged rearward toward the mirror casing and that engages the boss or projection to provide a biasing or stabilizing force at the mirror casing. The spring-loaded element has a curved (such as spherically curved) surface that engages a correspondingly curved (such as spherically curved) surface of the boss or projection of the mirror casing, such that the spring-loaded element engages the boss or projection throughout the range of adjustment of the mirror head relative to the bracket and mounting base.

Although described above as being attached at the bracket, the actuator may alternatively be attached at the mirror back plate, whereby the actuator engages the bracket such that actuation of the actuator adjusts the back plate (and mirror reflective element and mirror casing) relative to the bracket and mounting base. For example, and such as shown in FIGS. 16-20 , the mirror assembly 110 includes a mirror reflective element 112 and upper and lower mirror housing or casing 114 a, 114 b that are adjustable via an actuator 122 relative to a mounting arm or base 118. As shown in FIGS. 18 and 19 , the mirror actuator 122 has its body or base 122 a (that houses the actuator motors) attached at an actuator attachment plate 125 at the mirror back plate 124, while the actuator adapter plate 122 b is attached at the bracket 123.

By positioning the larger or deeper portion of the actuator (the body with motors) at the reflective element and the thinner portion of the actuator (the adapter plate), the pivot between the reflective element and the bracket (the pivot of the actuator at the interface between the actuator body and the adapter plate) is moved closer to the bracket and closer to the pivot of the powerfold actuator (at the pivot tube and detent mechanism 132). By positioning the pivots closer together, the hole 115 that receives the outer end of the mounting arm or base portion can be smaller because the hole region is closer to the pivot and the movement of the mirror casing at the hole region is thus reduced.

Thus, the exterior rearview mirror assembly 110 reverses the mounting of the mirror actuator by rigidly attaching the body of the actuator to a plate behind the mirror glass. The adapter plate of the mirror actuator (which is traditionally fixed behind the mirror reflective element) is fixed to the inner bracket of the mirror head. This mounting scheme reduces and minimizes the distance between the glass actuator pivot and the powerfold pivot, thereby reducing the size of the hole where the outer end region of the mirror mounting arm or base enters the mirror head.

Because the mirror head (instead of just the mirror reflective element) pivots to adjust the rearward field of view for the driver of the vehicle (when the mirror head is in the use or extended position), any accessory, such as a turn signal indicator or blind spot indicator or the like, that is disposed in the mirror head may be adapted so that the accessory function provides the desired or appropriate function, such that, for example, an indicator emits light toward the appropriate location, regardless of how the mirror head may be adjusted. For example, and such as can be seen with reference to FIG. 21 , a turn signal indicator may be disposed at the outboard region of the mirror casing and mirror head and may operate to emit light rearward along the side of the vehicle so as to be viewable by a driver of another vehicle rearward and/or at the side lane adjacent to the equipped vehicle (such as a rearward overtaking vehicle or the like). There are regulations for such turn signal indicators that require the light emitted by the turn signal indicator to be viewable through a range of angles at the side of the vehicle.

Because the mirror head (including the turn signal indicator) adjusts (as can be seen via the different positions of the mirror head shown in FIG. 21 ), the beam or cone of light emitted by the turn signal indicator also adjusts with the mirror head. The turn signal regulations (such as an ECE regulation or the like, such as ECE R48 (Uniform Provisions Concerning the Approval of Vehicles with Regard to the Installation of Lighting and Light-Signaling Devices), which is hereby incorporated herein by reference in its entirety, or such as an SAE standard, such as SAE J914 (Surface Vehicle Standard), which is hereby incorporated herein by reference in its entirety) must be met at all housing rotations. To accommodate for this, the indicator light emitting diodes (LEDs) and optics are configured so that a cone or beam of light is emitted by the indicator that meets the regulated intensity and that is wide enough to encompass the regulated region throughout the range of adjustment of the mirror head relative to the side of the vehicle. As shown in FIG. 21 , the regulation target zone for light output can be expanded by the degrees of rotation vertically and horizontally to meet the regulation. Both the vertical span and the horizontal span of the emitted light beam or cone may be expanded to meet the regulations/requirements for all mirror head positions. For example, and such as shown in FIG. 22 , for the ECE requirement that at least a threshold intensity of emitted light must be within a window or region 31 that spans 5 degrees to 60 degrees horizontally (relative to the side of the vehicle) and −15 degrees to 15 degrees vertically, the indicator may emit such a threshold light intensity over a larger region, such as a region 33 that spans −5 degrees to 70 degrees horizontally (relative to the side of the vehicle) and −25 degrees to 25 degrees vertically, so that, as the mirror head is adjusted during use, the threshold intensity of light will be provided at the required region 31. When so expanded, the light is within the regulation requirements irrespective of the position of the mirror head relative to the side of the vehicle. Because the indicator/light source moves with the mirror head, the indicator (such as the LEDs and/or optics of the indicator) is configured to create a large enough rectangle for the ECE R48 and/or SAE J914 required uniform light and threshold intensity light, so that the regulated light intensity and uniformity is provided at the required window or region.

Similarly, for a mirror mounted camera (that is mounted at the mirror head or mirror casing and thus that pivots or moves with the mirror head when the mirror reflective element is adjusted to provide the desired or selected rearward field of view for the driver of the vehicle), the camera's field of view should be expanded so as to encompass a required area or region for all mirror head positions. For example, and such as shown in FIG. 23 , the camera (such as a camera installed at the mirror head that is part of a multi-camera surround vision/birds-eye view system of the equipped vehicle) moves with the mirror head and mirror reflective element. The camera thus should have an extra or expanded field of view (such as achieved via a wide angle lens) such that the camera's field of view encompasses the required region throughout the range of adjustment of the mirror head (when in the extended or non-folded orientation). As shown in FIG. 23 , the camera may have a wide angle field of view that, when the mirror is rotated up (see 35), fully encompasses the required field of view (see 37), and when the mirror is rotated down (see 39), still fully encompasses the required field of view 37. The camera may be part of a multi-camera surround view system of the vehicle, which may utilize aspects of the systems described in U.S. Pat. Nos. 9,900,522; 9,834,153; 9,762,880 and/or 9,126,525, and/or U.S. Publication Nos. US-2015-0022664; US-2014-0340510 and/or US-2012-0162427, which are all hereby incorporated herein by reference in their entireties.

Optionally, the camera may have a wider field of view and an image processor may process image data captured by the camera to dynamically and digitally crop the image appropriately at any possible mirror head position. The processor may dynamically and digitally crop the image data responsive to the location or orientation of the mirror head so that the image data is dynamically cropped as a function of movement of the mirror head. For example, the camera or processor may read an actuator memory voltage to determine the orientation of the mirror head relative to the side of the vehicle and thus to determine the appropriate crop parameters. When cropped, the cropped frame of image data captured by the camera provides the appropriate field of view that encompasses the appropriate or required region at the side of the vehicle (such as for object detection and/or for a surround view display system of the vehicle). The image data of the cropped frame may be further processed for object detection and/or may be used for a surround view display or the like, while the image data outside of the cropped frame may be ignored.

Optionally, the accessory may be adjustably mounted at the mirror head and may be adjusted to maintain its direction or field of view or beam of light (such as its field of view for a camera or beam direction for an indicator) as the mirror head is adjusted relative to the vehicle to adjust the rearward field of view of the reflective element as viewed by the driver. In such an application, the adjustment mechanism for the accessory is operable responsive to the change in position of the mirror head.

Thus, the mirror assembly of the present invention provides a mirror head that supports the mirror reflective element at the mirror casing and that pivots or adjusts relative to the mounting base and the side of the vehicle to provide a driver's rearward field of view. The mirror casing may provide a universal mirror casing, where a selected mirror reflective element may be attached at the mirror casing. For example, and such as shown in FIGS. 24A-C and 25A-C, the variation in the glass curvature (for example, flat, a 1260 mm radius of curvature, and a 1016 mm radius of curvature) can be implemented by a change in the glass case while keeping the housing styling the same.

Optionally, the mirror assembly of the present invention may include a blind spot mirror (FIGS. 26-28 ) comprising an auxiliary wide angle reflective element 40 disposed at an upper outboard corner or region of the mirror head, with the principal mirror reflective element 12′ formed to partially circumscribe the inner perimeter region of the auxiliary element. The auxiliary element comprises a curved reflective surface (such as by utilizing aspects of the mirror elements described in U.S. Pat. No. 9,694,750, which is hereby incorporated herein by reference in its entirety). In the illustrated embodiment, the exterior surface of the auxiliary element is generally co-planar with the exterior surface of the principal reflective element, while providing a frameless reflective element construction around the periphery of the reflective element and mirror head (optionally with a demarcation or back plate portion disposed between the auxiliary reflective element and principal reflective element). A similar ground and polished homologated rounded edge may be provided for the blind zone mirror or auxiliary reflective element and the main glass or principal reflective element.

For example, and such as shown in FIGS. 26-28 , the outer perimeter edge regions of the auxiliary reflective element are rounded so that they correspond with the outer perimeter edge regions of the principal reflective element. In such an application, the principal mirror reflective element and the auxiliary reflective element cooperate to provide a rounded or ground perimeter edge region at the periphery of the front surface of the combined reflective element, with the rounded or ground or polished perimeter edge regions of the glass substrates of the reflective elements exposed to or viewable by the driver of the vehicle (and which optionally may comprise a polished perimeter that is polished to a water-clear finish and may have a radius of curvature of at least about 2.5 mm). The rounded perimeter edges of the glass substrates of the mirror reflective elements may provide a generally smooth or continuous transition from the respective generally planar (or curved) front surfaces of the mirror reflective elements to the outer surface of the mirror head or mirror casing at which the mirror reflective elements are mounted.

The inboard perimeter edge regions of the auxiliary reflective element and the perimeter edge regions of the principal reflective element that are at the cutout region (such as the outboard upper corner region) where the auxiliary reflective element is disposed are not rounded and provide a generally planar flush surface at the junction or demarcation line between the auxiliary reflective element and the principal reflective element. In the illustrated embodiment, a gap between the auxiliary reflective element and the principal reflective element is filled with a demarcation element, such as a lip or portion of the mirror back plate. The demarcation lip or portion of the back plate is molded or formed to follow the shape of the cut out region of the principal reflective element and the inboard perimeter edges of the auxiliary reflective element when the auxiliary reflective element and the principal reflective element are disposed at or attached at or adhered at the back plate.

The mirror head is adjusted via the actuator or actuators, which are via a control or controller (see FIG. 29 ). The control schematic of FIG. 29 receives three pair of inputs from the vehicle (vertical and horizontal glass actuation and powerfold actuation) and provides two pair of outputs (Mirror X+, X−, Y+, Y−) to a two motor actuator (that may provide adjustment of the mirror head for rearview adjustment and for powerfold adjustment, such as by utilizing aspects of the mirror assemblies and actuators disclosed in U.S. Publication No. US-2015-0224930 and/or U.S. Pat. Nos. 9,827,913 and/or 8,915,601, which are hereby incorporated herein by reference in their entireties). To differentiate the horizontal glass motion from the powerfold motion, the controller sends a modulated signal that reduces the horizontal speed for glass motion, and allows for full speed for powerfold motion. The vertical adjustment speed (Mirror Y+, Y−) may be at the same speed (or a different speed) as the reduced horizontal speed for glass motion. The sensors can be implemented in order to compensate for differences in drive voltage and temperature.

Thus, the mirror actuator may comprise a two-motor actuator that is operable to pivot the mirror head horizontally and vertically via respective motors. The two-motor actuator may also be operable to pivot the mirror head relative to the base portion between a folded or non-use position and an extended or use position. The two-motor actuator, when electrically powered to horizontally adjust the mirror reflective element, pivots the mirror head at a rate that is slower than a rate of horizontally pivoting of the mirror head when pivoting the mirror head between the folded or non-use position and the extended or use position.

The exterior rearview mirror assembly of the present invention provides a frameless exterior rearview mirror assembly. The actuator adjusts the reflective element in tandem with the mirror casing, and the circumferential perimeter edges of the outermost glass substrate of the mirror reflective element are exposed and contactable by a person and are rounded with a radius of curvature of at least 2.5 mm, so as to mitigate injury to that person upon contact.

Optionally, accessories, such as turn signal indicators or ground illumination lights or spotlights or cameras, can be disposed at the mounting arm/base attached at the vehicle so that any light beam axis or camera viewing axis remains unchanged when the mirror head adjusts relative to the mounting arm/base.

The mirror assembly of the present invention allows for inclusion of other accessories (such as turn signal indicators, blind spot indicators, lights, displays and/or the like) in the mirror head, without concerns of interference with conventional actuators disposed in the mirror head and at and behind the mirror reflective element. The exterior rearview mirror assembly and/or actuators may utilize aspects of the exterior rearview mirror assemblies described in U.S. Pat. Nos. 9,827,913; 9,346,403; 9,067,541; 8,915,601; 8,764,256; 7,722,199; 7,314,285; 7,267,449; 7,159,992; 7,104,663; 7,093,946; 7,080,914; 7,073,914; 6,916,100; 6,755,544; 6,698,905; 6,685,864; 6,467,920; 6,362,548; 6,312,135; 6,243,218; 6,229,226; 6,213,612; 5,986,364; 5,900,999 and/or 5,703,731, and/or U.S. Publication No. US-2007-002477, which are all hereby incorporated herein by reference in their entireties.

Optionally, for example, the technology of the present invention allows for new technology or content to be readily added to and mounted into the mirror head. For example, the mirror head may include a camera disposed behind the reflective element, and/or the mirror head may include a display screen (such as a liquid crystal display screen or the like) disposed behind the reflective element and/or the mirror head may include any other electronic or mechanical content, such as, for example, a blind spot indicator and/or a turn signal indicator and/or an illumination module and/or wide angle reflector elements and/or the like (such as by utilizing aspects of the exterior mirror assemblies described in U.S. Pat. Nos. 8,786,704; 8,058,977; 7,944,371; 7,492,281; 6,198,409; 5,929,786; 5,786,772; 7,626,749; 7,581,859; 6,227,689; 6,582,109; 5,371,659; 5,497,306; 5,669,699; 5,823,654; 6,176,602; 6,276,821; 7,748,856; 7,255,451; 7,195,381; 6,717,712; 7,126,456; 6,315,419; 7,097,312 and/or 6,522,451, which are hereby incorporated herein by reference in their entireties).

Optionally, the reflective element may comprise a frameless reflective element, such as the types shown and/or described in U.S. Pat. Nos. 7,253,723; 8,154,418; 8,508,831; 8,730,553; 9,598,016 and/or 9,346,403, and/or U.S. Publication Nos. US-2014-0313563 and/or US-2015-0097955, which are hereby incorporated herein by reference in their entireties. In such an application, the mirror reflective element may have a rounded or ground perimeter edge region at its periphery of the front surface, and such a rounded or ground or polished perimeter edge region of the glass substrate of the reflective element may be exposed to or viewable by the driver of the vehicle and may comprise a polished perimeter that is polished to a water-clear finish and may have a radius of curvature of at least about 2.5 mm. The rounded perimeter edge of the glass substrate of the mirror reflective element may provide a generally smooth or continuous transition from the generally planar (or slightly curved) front surface of the mirror reflective element to the outer surface of the mirror head or mirror casing at which the mirror reflective element is mounted. Optionally, the mirror reflective element may have a thin or very thin bezel at the perimeter region of the front surface of the reflective element, and optionally, the mirror reflective element may have a clear bezel at the perimeter region of the front surface of the reflective element, or the like, depending on the particular application of the mirror assembly and the desired appearance and/or styling of the mirror assembly.

Optionally, other mirror designs or configurations may be contemplated in accordance with the present invention, such as various configurations of the mirror casing and reflective element and any bezel at the mirror reflective element. For example, the mirror assembly may include a plastic molding that comprises a portion that (a) abuts a circumferential edge of the mirror glass substrate (such as the front glass substrate of an electrochromic mirror reflective element or a glass prism of a prismatic mirror reflective element) and (b) has an outer curved surface that extends from generally adjacent to a first surface of the glass substrate and that may lack a sharp edge, such as described in U.S. Pat. Nos. 7,255,541; 7,289,037; 7,360,932; 8,049,640 and/or 8,529,108, which are hereby incorporated herein by reference in their entireties. Optionally, the mirror assembly may include a conventional bezel, such as described in U.S. Pat. No. 7,224,324, which is hereby incorporated herein by reference in its entirety.

Optionally, the mirror assembly may include various other features, such as lighting and/or indicators and/or blind spot detectors and/or wide angle reflectors or spotter mirrors and/or the like. For example, the mirror assembly may include any other electronic or mechanical content, such as, for example, a blind spot indicator and/or a turn signal indicator and/or an illumination module and/or wide angle reflector elements and/or the like (such as by utilizing aspects of the exterior mirror assemblies described in U.S. Pat. Nos. 8,786,704; 8,058,977; 7,944,371; 7,626,749; 7,492,281; 6,198,409; 5,929,786; 5,786,772; 7,581,859; 6,227,689; 6,582,109; 5,371,659; 5,497,306; 5,669,699; 5,823,654; 6,176,602; 6,276,821; 7,748,856; 7,255,451; 7,195,381; 6,717,712; 7,126,456; 6,315,419; 7,097,312 and/or 6,522,451, which are hereby incorporated herein by reference in their entireties).

Optionally, the mirror element may include a blind spot viewing auxiliary wide angle spotter mirror element that may be of the integrated type (such as described in U.S. Pat. No. 6,315,419 and/or U.S. Pub. No. US-2008-0225421, which are hereby incorporated herein by reference in their entireties) or that may be a coplanar type or a circular spotter type or a WideVue™ type or construction (such as supplied by Magna Mirrors of America, Inc., of Holland, Mich.), such as in accordance with U.S. Pat. Nos. 6,522,451; 6,717,712; 7,167,294; 7,589,883 and/or 8,267,534, which are hereby incorporated herein by reference in their entireties. Also, the unitary reflective element sub-assembly may comprise an extended field of view mirror reflective element, such as a reflective element utilizing aspects of the mirrors described in U.S. Pat. No. 7,420,756, which is hereby incorporated herein by reference in its entirety.

As discussed above, the mirror assembly may comprise an electro-optic or electrochromic mirror assembly that includes an electro-optic or electrochromic reflective element. The perimeter edges of the reflective element may be encased or encompassed by the perimeter element or portion of the bezel portion to conceal and contain and envelop the perimeter edges of the substrates and the perimeter seal disposed therebetween. The electrochromic mirror element of the electrochromic mirror assembly may utilize the principles disclosed in commonly assigned U.S. Pat. Nos. 8,503,061; 7,274,501; 7,255,451; 7,195,381; 7,184,190; 6,690,268; 5,140,455; 5,151,816; 6,420,036; 6,178,034; 6,154,306; 6,002,544; 5,567,360; 5,525,264; 5,610,756; 5,406,414; 5,253,109; 5,076,673; 5,073,012; 5,117,346; 5,724,187; 5,668,663; 5,910,854; 5,142,407 and/or 4,712,879, which are hereby incorporated herein by reference in their entireties.

The exterior rearview mirror assembly may include a casing, such as described above, or the mirror assembly may comprise or utilize aspects of other types of casings or the like, such as described in U.S. Pat. Nos. 7,338,177; 7,289,037; 7,249,860; 6,439,755; 4,826,289 and/or 6,501,387, which are all hereby incorporated herein by reference in their entireties, without affecting the scope of the present invention. For example, the mirror assembly may utilize aspects of the flush or frameless or bezelless reflective elements described in U.S. Pat. Nos. 7,626,749; 7,360,932; 7,289,037; 7,255,451; 7,274,501 and/or 7,184,190, and/or in U.S. Pat. Pub. No. US-2006-0061008, which are all hereby incorporated herein by reference in their entireties.

Changes and modifications in the specifically described embodiments may be carried out without departing from the principles of the present invention, which is intended to be limited only by the scope of the appended claims as interpreted according to the principles of patent law. 

The invention claimed is:
 1. A vehicular exterior rearview mirror assembly, the vehicular exterior rearview mirror assembly comprising: a base portion having a first end and a second end, wherein the first end of the base portion is configured for attachment at a side of a vehicle equipped with the vehicular exterior rearview mirror assembly to mount the vehicular exterior rearview mirror assembly at the side of the equipped vehicle; a mirror head comprising a mirror reflective element, an attachment plate and an electrically-operable mirror actuator; wherein the base portion extends through an aperture of the mirror head so that the second end of the base portion is within the mirror head; wherein the attachment plate comprises a front side and a rear side separated by a thickness dimension of the attachment plate; wherein the mirror reflective element is attached at the front side of the attachment plate; wherein the mirror actuator is attached at the rear side of the attachment plate; wherein the mirror reflective element comprises a glass substrate having a front surface and a rear surface separated by a thickness dimension of the glass substrate, and wherein a perimeter circumferential edge of the glass substrate spans between the front surface and the rear surface; wherein, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, an outermost side of the mirror reflective element is exposed and viewable by a driver of the equipped vehicle when the driver is operating the equipped vehicle; wherein the outermost side of the mirror reflective element comprises the front surface of the glass substrate; wherein the attachment plate of the mirror head comprises wall structure that extends from the front side of the attachment plate; wherein the wall structure that extends from the front side of the attachment plate circumscribes and spans the perimeter circumferential edge of the glass substrate of the mirror reflective element; wherein the wall structure that extends from the front side of the attachment plate does not encroach onto and does not overlap the front surface of the glass substrate of the mirror reflective element; wherein, when the mirror actuator is electrically operated, the mirror actuator, the attachment plate and the mirror reflective element of the mirror head move together and in tandem relative to the base portion; wherein the mirror actuator, when electrically operated, adjusts the mirror head relative to the base portion to adjust a rearward field of view provided by the mirror reflective element to the driver of the equipped vehicle who is viewing the mirror reflective element with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle; and wherein the aperture allows for movement of the mirror head relative to the base portion during operation of the mirror actuator.
 2. The vehicular exterior rearview mirror assembly of claim 1, wherein an adapter plate for the mirror actuator is disposed at the second end of the base portion.
 3. The vehicular exterior rearview mirror assembly of claim 2, wherein a partial spherical portion of the mirror actuator engages a partial spherical portion of the adapter plate to pivotally attach the mirror actuator at the adapter plate at the second end of the base portion.
 4. The vehicular exterior rearview mirror assembly of claim 1, wherein the vehicular exterior rearview mirror assembly comprises a breakaway exterior rearview mirror assembly.
 5. The vehicular exterior rearview mirror assembly of claim 1, wherein the vehicular exterior rearview mirror assembly comprises a powerfold exterior rearview mirror assembly.
 6. The vehicular exterior rearview mirror assembly of claim 5, wherein the base portion comprises a powerfold actuator operable to move the mirror head between (i) an extended position where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is in a use position providing a rearward field of view to the driver of the equipped vehicle, and (ii) a folded position, where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is folded at least partially toward the side of the equipped vehicle.
 7. The vehicular exterior rearview mirror assembly of claim 6, wherein the powerfold actuator is electrically operable to move the mirror head relative to the base portion between the extended position and the folded position with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle.
 8. The vehicular exterior rearview mirror assembly of claim 1, wherein the mirror head comprises an electrically-operated accessory that moves together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element, and wherein the accessory, when electrically operated, meets a performance requirement throughout a range of adjustment of the mirror head relative to the base portion with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle.
 9. The vehicular exterior rearview mirror assembly of claim 8, wherein the electrically-operated accessory is disposed behind the mirror reflective element.
 10. The vehicular exterior rearview mirror assembly of claim 8, wherein the electrically-operated accessory comprises a turn signal indicator, and wherein the turn signal indicator, when electrically-operated and with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, emits light that illuminates within a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 11. The vehicular exterior rearview mirror assembly of claim 8, wherein the electrically-operated accessory comprises a camera that has an exterior field of view sideward of the equipped vehicle with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, and wherein the camera, when electrically-operated, views a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 12. The vehicular exterior rearview mirror assembly of claim 11, wherein an image processor processes image data captured by the camera.
 13. The vehicular exterior rearview mirror assembly of claim 12, wherein the image processor crops frames of captured image data responsive to the orientation of the mirror head relative to the base portion when the respective frames of image data were captured for processing of the performance-required region.
 14. The vehicular exterior rearview mirror assembly of claim 1, comprising a flexible gasket provided at the aperture of the mirror head to limit intrusion of contaminants into the mirror head with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, and wherein the flexible gasket allows for movement of the mirror head relative to the base portion.
 15. The vehicular exterior rearview mirror assembly of claim 1, wherein the mirror head comprises a mirror casing that at least partially encases the mirror actuator and the attachment plate and that, when the mirror actuator is electrically operated, moves relative to the base portion together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element.
 16. The vehicular exterior rearview mirror assembly of claim 15, comprising a biasing element at least partially disposed between the base portion and the mirror casing to provide a stabilizing force at the mirror casing, wherein the biasing element comprises a curved surface that engages a corresponding curved inner surface of the mirror casing.
 17. The vehicular exterior rearview mirror assembly of claim 16, wherein the curved surface of the biasing element movably engages the corresponding curved inner surface of the mirror casing when the mirror actuator is electrically operated to adjust the mirror head relative to the base portion.
 18. The vehicular exterior rearview mirror assembly of claim 15, wherein the aperture allows for movement of the mirror head relative to the base portion during operation of the mirror actuator without direct contact between the mirror casing and the base portion.
 19. The vehicular exterior rearview mirror assembly of claim 1, wherein the mirror reflective element is adhesively attached at the front side of the attachment plate.
 20. The vehicular exterior rearview mirror assembly of claim 1, wherein the glass substrate of the mirror reflective element comprises a mirror reflector-coated glass substrate.
 21. The vehicular exterior rearview mirror assembly of claim 1, wherein the glass substrate of the mirror reflective element comprises a planar glass substrate, and wherein the front surface of the glass substrate of the mirror reflective element comprises a front planar surface and the rear surface of the glass substrate of the mirror reflective element comprises a rear planar surface separated from the front planar surface by the thickness dimension of the glass substrate.
 22. The vehicular exterior rearview mirror assembly of claim 21, wherein the glass substrate of the mirror reflective element comprises a mirror reflector-coated glass substrate.
 23. The vehicular exterior rearview mirror assembly of claim 22, wherein the front surface of the glass substrate is coated with a mirror reflector.
 24. The vehicular exterior rearview mirror assembly of claim 1, wherein the mirror reflective element comprises an electrochromic mirror reflective element having a front glass substrate and a rear glass substrate with an electrochromic medium disposed between the front glass substrate and the rear glass substrate and bounded by a perimeter seal, and wherein the front glass substrate of the electrochromic mirror reflective element comprises the glass substrate of the mirror reflective element.
 25. The vehicular exterior rearview mirror assembly of claim 1, wherein the first end of the base portion of the vehicular exterior rearview mirror assembly is configured for mounting at a side door of the equipped vehicle.
 26. The vehicular exterior rearview mirror assembly of claim 1, wherein the mirror actuator comprise two electrically operated motors.
 27. A vehicular exterior rearview mirror assembly, the vehicular exterior rearview mirror assembly comprising: a base portion having a first end and a second end, wherein the first end of the base portion is configured for attachment at a side door of a vehicle equipped with the vehicular exterior rearview mirror assembly to mount the vehicular exterior rearview mirror assembly at the side door of the equipped vehicle; a mirror head comprising a mirror reflective element, an attachment plate and an electrically-operable mirror actuator; wherein the base portion extends through an aperture of the mirror head so that the second end of the base portion is within the mirror head; wherein the attachment plate comprises a front side and a rear side separated by a thickness dimension of the attachment plate; wherein the mirror reflective element is adhesively attached at the front side of the attachment plate; wherein the mirror actuator is attached at the rear side of the attachment plate; wherein the mirror reflective element comprises a glass substrate having a front surface and a rear surface separated by a thickness dimension of the glass substrate, and wherein a perimeter circumferential edge of the glass substrate spans between the front surface and the rear surface; wherein the glass substrate of the mirror reflective element comprises a mirror reflector-coated glass substrate; wherein, with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle, an outermost side of the mirror reflective element is exposed and viewable by a driver of the equipped vehicle when the driver is operating the equipped vehicle; wherein the outermost side of the mirror reflective element comprises the front surface of the glass substrate; wherein the attachment plate of the mirror head comprises wall structure that extends from the front side of the attachment plate; wherein the wall structure that extends from the front side of the attachment plate circumscribes and spans the perimeter circumferential edge of the glass substrate of the mirror reflective element; wherein the wall structure that extends from the front side of the attachment plate does not encroach onto and does not overlap the front surface of the glass substrate of the mirror reflective element; wherein, when the mirror actuator is electrically operated, the mirror actuator, the attachment plate and the mirror reflective element of the mirror head move together and in tandem relative to the base portion; wherein the mirror actuator, when electrically operated, adjusts the mirror head relative to the base portion to adjust a rearward field of view provided by the mirror reflective element to the driver of the equipped vehicle who is viewing the mirror reflective element with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle; and wherein the aperture allows for movement of the mirror head relative to the base portion during operation of the mirror actuator.
 28. The vehicular exterior rearview mirror assembly of claim 27, wherein an adapter plate for the mirror actuator is disposed at the second end of the base portion.
 29. The vehicular exterior rearview mirror assembly of claim 27, wherein the vehicular exterior rearview mirror assembly comprises a breakaway exterior rearview mirror assembly.
 30. The vehicular exterior rearview mirror assembly of claim 27, wherein the vehicular exterior rearview mirror assembly comprises a powerfold exterior rearview mirror assembly, and wherein the base portion comprises a powerfold actuator operable to move the mirror head between (i) an extended position where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is in a use position providing a rearward field of view to the driver of the equipped vehicle, and (ii) a folded position, where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is folded at least partially toward the side of the equipped vehicle.
 31. The vehicular exterior rearview mirror assembly of claim 30, wherein the powerfold actuator is electrically operable to move the mirror head relative to the base portion between the extended position and the folded position with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle.
 32. The vehicular exterior rearview mirror assembly of claim 27, wherein the mirror head comprises an electrically-operated accessory that moves together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element, and wherein the accessory, when electrically operated, meets a performance requirement throughout a range of adjustment of the mirror head relative to the base portion with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle.
 33. The vehicular exterior rearview mirror assembly of claim 32, wherein the electrically-operated accessory comprises a turn signal indicator, and wherein the turn signal indicator, when electrically-operated and with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle, emits light that illuminates within a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 34. The vehicular exterior rearview mirror assembly of claim 32, wherein the electrically-operated accessory comprises a camera that has an exterior field of view sideward of the equipped vehicle with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle, and wherein the camera, when electrically-operated, views a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 35. The vehicular exterior rearview mirror assembly of claim 27, comprising a flexible gasket provided at the aperture of the mirror head to limit intrusion of contaminants into the mirror head with the vehicular exterior rearview mirror assembly mounted at the side door of the equipped vehicle, and wherein the flexible gasket allows for movement of the mirror head relative to the base portion.
 36. The vehicular exterior rearview mirror assembly of claim 27, wherein the mirror head comprises a mirror casing that at least partially encases the mirror actuator and the attachment plate and that, when the mirror actuator is electrically operated, moves relative to the base portion together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element.
 37. The vehicular exterior rearview mirror assembly of claim 36, comprising a biasing element at least partially disposed between the base portion and the mirror casing to provide a stabilizing force at the mirror casing, wherein the biasing element comprises a curved surface that engages a corresponding curved inner surface of the mirror casing, and wherein the curved surface of the biasing element movably engages the corresponding curved inner surface of the mirror casing when the mirror actuator is electrically operated to adjust the mirror head relative to the base portion.
 38. The vehicular exterior rearview mirror assembly of claim 27, wherein the glass substrate of the mirror reflective element comprises a planar glass substrate, and wherein the front surface of the glass substrate of the mirror reflective element comprises a front planar surface and the rear surface of the glass substrate of the mirror reflective element comprises a rear planar surface separated from the front planar surface by the thickness dimension of the glass substrate.
 39. The vehicular exterior rearview mirror assembly of claim 27, wherein the front surface of the glass substrate is coated with a mirror reflector.
 40. The vehicular exterior rearview mirror assembly of claim 27, wherein the mirror actuator comprises two electrically operated motors.
 41. A vehicular exterior rearview mirror assembly, the vehicular exterior rearview mirror assembly comprising: a base portion having a first end and a second end, wherein the first end of the base portion is configured for attachment at a side of a vehicle equipped with the vehicular exterior rearview mirror assembly to mount the vehicular exterior rearview mirror assembly at the side of the equipped vehicle; a mirror head comprising a mirror reflective element, an attachment plate and an electrically-operable mirror actuator; wherein the base portion extends through an aperture of the mirror head so that the second end of the base portion is within the mirror head; wherein the attachment plate comprises a front side and a rear side separated by a thickness dimension of the attachment plate; wherein the mirror reflective element is adhesively attached at the front side of the attachment plate; wherein the mirror actuator is attached at the rear side of the attachment plate; wherein the mirror reflective element comprises an electrochromic mirror reflective element having a front glass substrate and a rear glass substrate with an electrochromic medium disposed between the front glass substrate and the rear glass substrate and bounded by a perimeter seal; wherein the front glass substrate has a front surface and a rear surface separated by a thickness dimension of the front glass substrate, and wherein a perimeter circumferential edge of the front glass substrate spans between the front surface and the rear surface; wherein, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, an outermost side of the mirror reflective element is exposed and viewable by a driver of the equipped vehicle when the driver is operating the equipped vehicle; wherein the outermost side of the mirror reflective element comprises the front surface of the front glass substrate; wherein the rear glass substrate of the mirror reflective element comprises a mirror reflector-coated glass substrate; wherein the attachment plate of the mirror head comprises wall structure that extends from the front side of the attachment plate; wherein the wall structure that extends from the front side of the attachment plate circumscribes and spans the perimeter circumferential edge of the front glass substrate of the mirror reflective element; wherein the wall structure that extends from the front side of the attachment plate does not encroach onto and does not overlap the front surface of the front glass substrate of the mirror reflective element; wherein, when the mirror actuator is electrically operated, the mirror actuator, the attachment plate and the mirror reflective element of the mirror head move together and in tandem relative to the base portion; wherein the mirror actuator, when electrically operated, adjusts the mirror head relative to the base portion to adjust a rearward field of view provided by the mirror reflective element to the driver of the equipped vehicle who is viewing the mirror reflective element with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle; and wherein the aperture allows for movement of the mirror head relative to the base portion during operation of the mirror actuator.
 42. The vehicular exterior rearview mirror assembly of claim 41, wherein an adapter plate for the mirror actuator is disposed at the second end of the base portion.
 43. The vehicular exterior rearview mirror assembly of claim 41, wherein the vehicular exterior rearview mirror assembly comprises a breakaway exterior rearview mirror assembly.
 44. The vehicular exterior rearview mirror assembly of claim 41, wherein the vehicular exterior rearview mirror assembly comprises a powerfold exterior rearview mirror assembly, and wherein the base portion comprises a powerfold actuator operable to move the mirror head between (i) an extended position where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is in a use position providing a rearward field of view to the driver of the equipped vehicle, and (ii) a folded position, where, with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, the mirror head is folded at least partially toward the side of the equipped vehicle.
 45. The vehicular exterior rearview mirror assembly of claim 44, wherein the powerfold actuator is electrically operable to move the mirror head relative to the base portion between the extended position and the folded position with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle.
 46. The vehicular exterior rearview mirror assembly of claim 41, wherein the mirror head comprises an electrically-operated accessory that moves together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element, and wherein the accessory, when electrically operated, meets a performance requirement throughout a range of adjustment of the mirror head relative to the base portion with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle.
 47. The vehicular exterior rearview mirror assembly of claim 46, wherein the electrically-operated accessory comprises a turn signal indicator, and wherein the turn signal indicator, when electrically-operated and with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, emits light that illuminates within a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 48. The vehicular exterior rearview mirror assembly of claim 46, wherein the electrically-operated accessory comprises a camera that has an exterior field of view sideward of the equipped vehicle with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, and wherein the camera, when electrically-operated, views a performance-required region throughout the range of adjustment of the mirror head relative to the base portion.
 49. The vehicular exterior rearview mirror assembly of claim 41, comprising a flexible gasket provided at the aperture of the mirror head to limit intrusion of contaminants into the mirror head with the vehicular exterior rearview mirror assembly mounted at the side of the equipped vehicle, and wherein the flexible gasket allows for movement of the mirror head relative to the base portion.
 50. The vehicular exterior rearview mirror assembly of claim 41, wherein the mirror head comprises a mirror casing that at least partially encases the mirror actuator and the attachment plate and that, when the mirror actuator is electrically operated, moves relative to the base portion together and in tandem with the mirror actuator, the attachment plate and the mirror reflective element.
 51. The vehicular exterior rearview mirror assembly of claim 50, comprising a biasing element at least partially disposed between the base portion and the mirror casing to provide a stabilizing force at the mirror casing, wherein the biasing element comprises a curved surface that engages a corresponding curved inner surface of the mirror casing, and wherein the curved surface of the biasing element movably engages the corresponding curved inner surface of the mirror casing when the mirror actuator is electrically operated to adjust the mirror head relative to the base portion.
 52. The vehicular exterior rearview mirror assembly of claim 41, wherein the first end of the base portion of the vehicular exterior rearview mirror assembly is configured for mounting at a side door of the equipped vehicle.
 53. The vehicular exterior rearview mirror assembly of claim 41, wherein the mirror actuator comprises two electrically operated motors. 